This item comes with a case that goes with it. The mounting type that is recommended is Surface Mount. The embedded file is in the 12-UFBGA, WLCSP case. Here is a list of Detection Switch functions for your reference. There is the possibility of applying the device in Audio Systems. There is a delivery within 2.8V~4.5V of the votage.
FSA8500UCX Features
With 12-UFBGA, WLCSP channels
FSA8500UCX Applications
There are a lot of ON Semiconductor FSA8500UCX Audio Special Purpose applications.